Manhole cover



' T. BEMIS, SR

Sept 14, 192

MANHOLE covER Filed July 28, 1924 I INVENTOR. 77/01: .BEM/fl ATTORNEYS.

the cover is entirely supported within and spaced from the inner periphery of the base support by the supporting ring 17.

The underside of the cover is provided with a plurality of radially extending latching means comprising the sliding bolts 23, slidably supportedtherein in position to engage under thelip 1''? of the supporting ring so as to prevent the removal of the cover when said bolt is moved to latching position. For normally maintaining the bolt in latching position, it is provided with a recess on the upper surface thereof into which a'plunger is forced under tension ofa-spring26 seated in'a suitable recess in the :underside of'said'cover. The outer ends of each of said bolts are provided with openings adapted to coincide with elongated openings 24: :in the cover through which a crowbar may be-extended for forcibly movingthe bolt in and'out of latching position.

Inith'e modified forms shown in Figs. 3 and 4, the structure is as above described with the exception that instead of employing an annular ring 16 cast integral with the inner surface of the lugs 14L,-the support for'the cover is provided by a projection or lug 1 16, which in effect takes the place of the combined Plugs l l-and ring 16,, said proj ection having ab'eveled portion 115 spacing the :supporting surface thereof from the inner periphery of 'the annular portion of the :supporting base.

The invention claimed isi:

l. A manhole cover comprising a supporting'base, a cover, and means formed on said supporting base for supporting said cover so as to permit the free passage of dirt or the like between the entire periphery of said cover and supporting base.

2. A manhole covercomprising asupportting base, a cover adapted to be supported thereon, and means formed on said base for supporting said cover, whereby the "lower outer edge thereof willbe spaced from and free .from engagement with any portion of said supporting base.

8. A manhole cover comprising a supporting base, a cover therefor, a plurality of inwardly projecting lugs formed on said projecting base having tapered upper =surfaces immediately =below and *spaced from the outer edge ofsaid eover when placed in supported position, and means formed on said lugs for engaging and supporting said cover inwardly and spaced from the :outer edge thereof.

4. A manhole cover comprising a supporting base, a eover adapted to be mounted thereon with its 'outer edge in slightly spaced relation-thereto, a plurality of lugs extending inwardly from the inner surface of said supporting base, and a supporting ring forming a part of the supporting base carried =by said lugs and spaced from the inner surface of said supporting base for providing passageways ibet'ween said lugs, whereby the outer edge of said cover will be supported by said ring and extend over said 1ugs=and passageways.

In witness whereof, I have hereunto affixed my signature.

THOMAS BnMrs, st. 

